Check valve



Jan. 9, 192 3,

J. P. CONLIN.

QHECK VALVE.

1& Q INVENTOR ATTORNEY Jam, 9, 119.23,

1. P. comm. gcHEcK VALVE. FILED APR. 25 1919- 2 SHEETS-SHEET 2.

INVENTOR [iv/9 (ZMA'N fig, ATTORNEY Patented Jan. 9, 1923.

' *1 STATES JOHNP. CONLIN, OF BROOKLYN, NEW YORK.

CHECK VALVE.

Application filed April 25, 1919. Serial No. 292,701.

17 0 allwkom it may concern:

Be it known that 1, JOHN P. CON-LrN, a citizen of the United States, anda resident of Brooklyn, county of Kings, city and State of New York,have invented new and use- 'for operation at high speeds: which allows alarge port opening with a small movement of the valve element which willwear for a long period, and which does not require lubrication.

A further object of the invention is to provide a valve of thischaracter WlllCh 1s self-grinding, whereby the valve element continuesto make a tight closure against its seat until so worn as to no longerhave the structural strength required to hold pressures against it. D

A further object of the invention is to provide a valve of thischaracter which embodies but few parts and which is designed to permitready replacement of the movable valve elements without special tools orgrlnding of the parts together.

Another advantage of the valve consists in the provision of a novel formof spring and valve element so designed that should either part break,the broken part cannot escape from the valve and drop into the cylinder.Also, the valve is of symmetrical exterior construction so that anyvalve may be used as either a suction or discharge valve by simplyreversing the valve itself.

Further advantages of my improved valve will appear from the followingspecification wherein I have described a preferred embodiment thereofwhich is especially adapted for use in ammonia compressors forice-making machines, but which may of course be used wherever a checkvalve is necessary. a

In the drawings, Fig. 1 shows my improved valve in cross section withthe parts assembled ready for insertion in the machine in which it is tobe used;

Fig. 2 is a plan view looking in the direction of the arrow, Fig. 1,showing the several parts of the valve broken away;

Figs. 3 and 4 are respectively! plan views of the two main parts of thevalve showing the1 faces opposite to those shown in Fig. 2; an

Fig. 5 shows in cross section an ammonia compressor of typical designequipped with my improved valves.

Referring to the drawings, 1 indicates one half of the valve which maybe termed the body thereof which, as here shown, comprises a plate ofsteel, cast iron or other suitable metal having a central hole 2 for theclamping bolt 3 by means of which the valve parts are secured together.

The inner face of the plate 1 is provided with a recess or countersink 4which is surrounded by an annular flange 5 formingone edge of the valveseat for the inner valve ring 6. The valve ring 6 is preferably formedof medium hard steel and consists merely of a flat ring of a widthsufficient to cover th inner annular valve port 7 with its inner edgeseated against the flange 5 and its outer edge against a similar flange8 surrounding the annular port.

The valve may consist of a single ring but I prefer to employ two ormore rings as shown, the outer ring being concentric with the inner ringand covering a similar annular port 10 concentric with the port 7. Theface of the valve body' 1 is turned down around the outer valve seat asshown at 11 and the face of the'disk is also provided with a groove 12between the flange 8 and the inner valve seat of the outer ring wherebythe edges of the rings'projectbeyond the edges of the flanges formingtheir valve seats for the purpose which will be presently described.

. The two annular ports 7 and 10 are bridged at intervals by webs 13 ofample width to maintain the disk against distortion under the strains towhich it is to be subjected, and the valve ports" are prefer-' ablyflared toward the outer face of the disk to permit an easy flow of thefluid.

The valve rings are held against their seats by springs 13 which arepreferably of the type shown, that is, he springs are coiled in a spiralafter the manner of a watch spring with the inner or small end thrustaxially out of the plane ofthe larger end. 1 preferably employ threesuch springs for each ring, the springsbeing set in recesses 14 boredinthe face .of the valve cap 15 which is also formed of a disk of metalof the same diameter as the valve body 1.

The holes inthe' valve cap are of the same diameter as the large end ofthe valve springs, whereby the valve springs fit snugly in the holes andare maintained in place without interfering with their action.

Between the recesses in which the springs are located the cap isprovided with a series of arcuate ports 16 for; the discharge of fluiddrawn through the valve, the ports being as large as consistent with thedesired ri idity of-the structure.-

0 allow free movement of the valves the face of the valve cap adjacentthe rings is formed with an annular recess of sufficient depth to-allowthe desired opening of the valves which need not, in a valve such asshown, be of a greater extent than indicated in the drawing. At theouter edge of the annular recess there is a flange 17, and at the centerof the disk there is a hub 18, the faces of the flange 17 and hub 18being machined or ground to fit against the machined or ground surfacesof the part 1 to thereby form an air-tight closure between the two parts.without packing. when they are clamped together by means of the centerbolt 3.

The same valve structure is designed to be used as either a. suction ordischarge valve by simply reversing the bolt 3 so as to have the nut onthe outside, to which end both the valve cap and valve body are turneddownv around their outer edges to provide similar shoulders 19 so as tofit the same cylinder opening in either position. In Figs. 1 and 2 ofthe drawings I have shown the valve arranged for use as a dischargevalve, that is, the head of the bolt is on the side of the body 1 of thevalve.

This feature of the valve is shown in Fig. 5 which shows the cylinder 20of a typical compressor with suction valves 21 on its ;upper side anddischarge v'alves 22 on the lower side; the suction valves having thecaps 15 turned toward the interior of the cylinder while the dischargevalves have the.

' a with eitherof said parts facing the cylinvalve'bodies 1 on .theinside. I

The parts may be bolted together in suitable manner,-,so long "as.thebolt does .not project beyond the valve at 'one end. In thearrangement showii, the bolt 3 which has no head is first screwed intothe part which is to-be on the inside (the body'l in Fig. 1)

until its end projects into the conical recess 24 on its outer face, andthe end riveted down into the recesses shown. After the springs andvalve rings are arranged in place .the cap 15 will be assembled in placeon the bolt'and the locking nut put on the outer end of the bolt;- Withthis constructionthere is little likelihood .of.the.-bolt will not'passthrough the port into the vention in detail, but it is of course to beloosening and dropping into the path of the piston.

In this connection it will also be noted that the springs 13are oflarger diameter than the width of the annular ports in the valve body sothat should the ring break or be wornthrough out of the springs, thespring cylinder.

It will be noted that the valve rings have a certain limited play ontheir seats, due to the lateral flexibility of the springs, and thislateral movement permits the valve rings to creep on their seats, due tothe vibration of the parts when the compressor is in operation, with theresult that the valve is virtually self-grinding, the marginal edges ofthe rings maintaining a true surface and a gas-tight joint against thevalve sea-ts until worn out.

Another important feature of my improved valve is'the arrangement of thethree annular ports in the valve cap in staggered relation to the twoports in the valve body, whereby the ribs or webs between the valveports and the cap lie opposite the centers of of the rings so thatwhenthe valve opens the rings are drawn back against these ribs whichuniformly reinforce them and prevent warping, even with very thin rings.Due to the valve construction a small movement of the rings"gi ve's afull port opening. The small movement of the ring permits very rapidoperation practically without noise" and without excessive compressionof the springs.

In the foregoing specification I have described the preferred embodimentof my in- 10 understood that the invention is not limited to suchdetails except in so far as recited in the appended claims.

I claim:

A valve of the class described comprising two parts, shoulders on saidparts for retaining the valve in the cylinder opening der, a pluralityof concentric annular ports 'in said parts, a plurality of separate,flat April, 1919.

JOHN P. CONLIN.

